Mark Kosters is the Chief Technology Officer of the American Registry for Internet Numbers (ARIN), responsible for all engineering initiatives within the organization, leading both development and operations. Mark has over thirty-one years of experience as an applications developer, networking engineer, technical manager and executive. For eighteen years previous to his employment at ARIN, he has been an engineer at Life Cycle Engineering, senior engineer at Data Defense Network (DDN) NIC, chief engineer and Principal Investigator under the NSF-sponsored Internet NIC (InterNIC), and Vice President of Research at VeriSign. Over his career, Mark has been involved in application design and implementation of core internet client/server tools, router administration, UNIX system administration, database administration, and network security. He has represented both network information centers in various technical forums such as the IETF, RIPE, APNIC, CaribNOG and NANOG. Additionally, he has co-invented four patents as well as co-authored many IETF RFCs running from directory services to IP Address Practices to improvements to DNSSEC.